# Creep of Chiral Domain Walls

## TL;DR

This paper develops a comprehensive creep theory for chiral domain walls in magnetic materials, accurately modeling experimental velocity data and extracting key material parameters without introducing extra free parameters.

## Contribution

The authors present a new creep theory for chiral domain walls that includes all major energy contributions and matches experimental data without additional free parameters.

## Key findings

- Model accurately describes domain wall velocities under in-plane fields.
- Material parameters like Dzyaloshinskii-Moriya interaction strength are extracted.
- Theory improves understanding of chiral domain wall dynamics.

## Abstract

Recent experimental studies of magnetic domain expansion under easy-axis drive fields in materials with a perpendicular magnetic anisotropy have shown that the domain wall velocity is asymmetric as a function of an external in plane magnetic field. This is understood as a consequence of the inversion asymmetry of the system, yielding a finite chiral Dzyaloshinskii-Moriya interaction. Numerous attempts have been made to explain these observations using creep theory, but, in doing so, these have not included all contributions to the domain wall energy or have introduced additional free parameters. In this article we present a theory for creep motion of chiral domain walls in the creep regime that includes the most important contributions to the domain-wall energy and does not introduce new free parameters beyond the usual parameters that are included in the micromagnetic energy. Furthermore, we present experimental measurements of domain wall velocities as a function of in-plane field that are well decribed by our model, and from which material properties such as the strength of the Dzyaloshinskii-Moriya interaction and the demagnetization field are extracted.